[113.04] Searches for High Redshift Neutral Hydrogen and Radio Frequency Interference

G. Langston, F. Ghigo, J. Acree (NRAO)

The Green Bank Telescope is used to search for high redshift
neutral hydrogen in the radio spectrum of high redshift
quasars. This technique is an important tool for
cosmological studies of the formation of galaxies. . The
detection of these absorption systems is difficult in the
presence of highly variable, terrestrial Radio Frequency
Interference (RFI). We present summarize known RFI sources
in the frequency range 290 to 920 MHz. The quasar 3C286 is
used as a reference for determination of the frequency
ranges where high redshift neutral hydrogen absorption may
be detected. A high resolution spectrum of neutral hydrogen
absorption at 839 MHz is presented.

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